<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>getElementsByTagName获取checkbox进行全选</title>
		<style type="text/css">
			#myTable{ width: 900px; margin: 0px auto; background-color: #008000;}
			#myTable td,#myTable th{ background-color: white;}
			#myDiv{width: 900px; margin: 0px auto; height: 30px; line-height: 30px; 
			text-align: center;}
		</style>
		<!-- <script>======代码======</script> -->
	</head>
	<body>
		<table cellspacing="1" id="myTable">
			<tr>
				<th width="200">
                  <input type="checkbox" id="selAll" onchange="getAll()" />全选
				<input type="checkbox" id="selAll" onchange="getBack()" />反选
                        </th>
				<th width="200">姓名</th>
				<th width="200">性别</th>
				<th width="200">专业</th>
				<th width="200">爱好</th>
			</tr>
			<tr>
				<td><input type="checkbox" onchange="getFalse()"/></td>
				<td>刘备</td>
				<td>男</td>
				<td>软件开发</td>
				<td>抽烟</td>
			</tr>
			<tr>
				<td><input type="checkbox" onchange="getFalse()"/></td>
				<td>关羽</td>
				<td>男</td>
				<td>国际贸易</td>
				<td>喝酒</td>
			</tr>
			<tr>
				<td><input type="checkbox" onchange="getFalse()"/></td>
				<td>张飞</td>
				<td>男</td>
				<td>园林设计</td>
				<td>烫头发</td>
			</tr>
			<tr>
				<td><input type="checkbox" onchange="getFalse()"/></td>
				<td>赵云</td>
				<td>男</td>
				<td>平面设计</td>
				<td>抽烟</td>
			</tr>
			<tr>
				<td><input type="checkbox" onchange="getFalse()"/></td>
				<td>黄忠</td>
				<td>男</td>
				<td>影视制作</td>
				<td>玩游戏</td>
			</tr>
			<tr>
				<td><input type="checkbox" onchange="getFalse()"></td>
				<td>小乔</td>
				<td>女</td>
				<td>高级护理</td>
				<td>唱歌</td>
			</tr>
		</table>
		<script>
        function getBack() {
				for (var index = 2; index <=7; index++) {
					var input = document.querySelectorAll('input')[index];
				if (document.querySelectorAll('input')[1].checked==true) {
					 if (input.checked==true) {
               			 input.checked = false;
           			} else {
                		input.checked = true;
          			  }
				}else {
					input.checked=false
				}
				}
				}
	    function getAll() {
			    
				for (var index = 2; index <=7; index++) {
					var input = document.querySelectorAll('input')[index];
					var input0 =document.querySelectorAll('input')[0]
           		 if (input0.checked==true) {
					input.checked = true;
				 }
				}
		      }
		function getFalse() {
			for (var index = 2; index <=7; index++) {
					var input = document.querySelectorAll('input')[index];
					var input0 =document.querySelectorAll('input')[0]
           		 if (input.checked==false) {
					input0.checked = false;
				 }else {
					 input0.checked=true
				 }
				}
		      }
		</script>
	</body>
</html>